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Broken underbody studs

Grim Grim

Grim Grim

PCGB Member
Member
I need to fit a new rear undertray to my 1990 964 C4. On inspecting the underside I found that many of the short threaded studs for the plastic nuts for retaining undertrays and side skirts were snapped and too short to use. Has anybody else found this, and what have been your solutions? I shudder at the thought of using self-tappers.
 
Grind down the broken stud flush with the underbody, drill out the stud then try using a rivstud. This is what many who have done this say is the best sturdy alternative.

This useless limited forum platform doesn't allow copy 'n paste images or images to be uploaded into the posting. So exaamples of rivstuds here - http://studs.m88play.com/rivet-type-studs/

DSC02337-572x345.jpg

DSC02337-572x345.jpg

 
Thank you, I'd contemplated something of this nature, but did not know that they were readily available.
 
It was due to a makeshift repair of this type that I need a new undertray, and it does not adress the problem of the side skirt nuts. But thank you for the suggestion.
 
https://www.ebay.co.uk/itm/ACURA-TRIM-CLIP-BUMPER-MOULDING-SIDE-PANEL-MOUNTING-WHEEL-ARCH-DOOR/301659795073?ssPageName=STRK%3AMEBIDX%3AIT&var=600512509309&_trksid=p2055119.m1438.l9372
https://www.ebay.co.uk/it...349526.m4383.l4275.c10
https://www.ebay.co.uk/itm/ACURA-TRIM-CLIP-BUMPER-MOULDING-SIDE-PANEL-MOUNTING-WHEEL-ARCH-DOOR/301659795073?ssPageName=STRK%3AMEBIDX%3AIT&var=600512509309&_trksid=p2055119.m1438.l9372


I dont know what type of fasteners you are looking for but eBay auto trimmers have thousands of different types. As most if not all are plastic they do not rust and are cheap and easy to fit. They come in a range of sizes, you will just have to trawl through them.

Ray

PS
Or the Rivnut system: http://www.bollhoff.co.uk/en/uk/fasteners/special_fasteners/riveting_technology/rivnut.php
https://www.youtube.com/watch?v=P_uu_ba6qAM
 
Rivstuds (and opposite nuts) are the favoured choice for permanent fixing alternatives.

Ray is right too - you can never have enough fastenings and fixings - plastic or stainless steel! :)
 
Dekker said:
I like the DIY tool inserter for Rivnuts
https://www.youtube.com/watch?v=AfQIYLSKGwI
Click to expand...
My rivet gun expands rivnuts but for only small diameter bolts. You can use a bolt, locking nut and two spanners. Aluminum rivnuts are the easiest to expand. The fitting of stainless steel rivnuts is a lot more difficult without the proper expansion tools.

Ray
 
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